View Code of Problem 80

    # include <stdio.h>
    int main()
    {
    	int n;
    	while(scanf("%d",&n)!=EOF&&n!=0)
    	{
    		int k , i ;
    		for(i = 1 ; i <= n ; i++)
    		{
    			k = (k+3)%i;
    		}
    		printf("%d\n",k+1);
    	}
    	return 0;
    }